Sealing ring and method of making it



y VJ. M. HOTHERSALL 1,856,335

' SEALING RING AND METHOD OF MAKING IT Filed March 22, 1928 2 Sheets-Sheet 1 May 3, 1932. J. M. HOTHERSALL SEALING RING AND METHOD OF MAKING IT .F'iled March 22, 1928 2 Sheets-Sheet 2 ATTOR N E\ Patented May 3, 1932 PATENT ol-"ricr.

JOHN M. EOTEEBSALL; OF BROOKLYN, NEW YORK,

ASSIGNOB 1'0 AMERICAN CAN GOM- LANY,OF NEW YORK, N. Y., A. CORPORATION OF NEW JERSH SEALING BING- AND METHOD OF G 3!!! Application filed. March 22, 1928. Serial No. 263,679..

This invention relates in general to containers and closures therefor, and has more particular reference to a cover sealing ring with lapped ends and the method of making it. a

A sealing ring with lapped ends, which is completely formed before being applied to use, to be the most eflective should have interior and exterior surfaces of uniform dimensions throughout, as this gives it a uniform clamping engagement with the cover and the container parts. Such a ring may be positioned in any circumferential part of the assembling die, and the overlapped portion may be placed in any position engagprovision of a' ing the container and cover without the necessity of an accurate and tedious alinement of the ring for engagement either with the container parts or the closure die. r

An important object of this invention is to provide such a sealin ring with overlapped ends which has umform interior and exterior dimensions.

Another important object is the provision as of a method of producing such a ring from a strip of sheet metal. 4

A further object of the invention is the provision of a sealingring which has cor rugations defining the exterior or interior diinensions of the ring, the corrugations being interlocked and ironed out smoothly where -'the ends are lapped, whereby the double thickness is not greater than a single thickness through the corrugations.

A further object of the invention isthe -die mechanism adapted to form such a rin with lapped ends the die being capable o forming the lap lrrespective of the position of the strip therein.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with discloses a preferred em odiment thereof.

. In the drawings:

Figure 1 is a perspective of a corrugated stri arranged in circularform ready for app ication to the die formin mechaniszgiq, Fig. 2 is a perspective 0 a sealing ring readily P p y produced in accordance with this invention;

Fig. 3 is a sectional view of die members for forming the ring as arranged just prior to the forming operation;

Fi 4 is a fragmentary view of the formed ring etween the die members, as taken upon a line 4-4 of Fig. 6, through the overlappirlpg portion;

ig. 5 is a similar fragmentary view, as

taken on the line 5-5 of Fig. 6, through a portion which does not overlap;

Fig. 6 is a perspective of a part of the formed ring at the overlapping portions, and

Fig. 7 is a diagrammatic view illustrating the different states of development of the ring.

Referring more particularly to the drawings, reference character 10 indicates a strip of sheet metal in which a top ed 'e 11 and bottom edge 12 are slightly curve in opposite directions and in which corrugations 13 are formed adjacentthe top edge 11, the corrugations having a depth substantially equal to the gauge of the strip. This strip is adapted to be bent or formed with the ends 14 overla ping for a distance embracing a number 0 the corrugations 13.

The completed annular or circular strip is formed in a die, and in Fig. 3 I show a die adapted to perform the forming opera-' tion. A die head 15 is movable to and from a fixed bed plate 16, the head and bed plate cooperating to form the sealing strip in a manner to be explained later. The die head 15 carries a formin ring 18 slidable upon a reduced portion 0 the head, the forming ring beingretained in position b a holding ring 19 secured to the head by bo ts 20. The forming ring 18 isnormally pressed downwardly from the die head by stiif springs 21, its downward movement being limited y an ,annular projection 22 cooperating with an annular shoulder in the holding ring '19;

The lower surface of the ring 1 8 isrformed with a depending ridge 33 around its outer the ridge being U-shaped in crosssection. A curlin depression 34 is formed just inside thisri go, and a flat contact surface 35 completes the lowered e of the ring.

The bed plate 16 is supported upon a spin- I formed in the holding ing ring v A Fig. 7). Further downward 24'. which surrounds the able ring 28 is formed with a curling recess of the sealing band circular head or dle 17 which extends into the 'bed of the press. A fixed forming ring 24 is positioned upon the bed plate 16 secured thereto by a holding plate 25 and bolts 26. The bed plate 16 has an annular recess 27 near the outer gagement. The movable forming rin 28 is supported in the recess 27 of the fixe rin bybolts' 29, which extend into a plate 30 belowthe bed plate 16, the plate 30 being suported-upon a buifer 31 of resilient material.

pward movement of the movable ring 28 is limited by an annular projection 50 engaging a shoulder 51 formed in a fixed ring recess 27. The mov- 38 adjacent its inner, upper periphery, this recess registering with a similar recess 37 ring 19 on the-die head. A portion 36 of the fixedring 24 provides' a flat contact surface which registers.

with the recess 34 formed in 'the upper movable forming ring 18.

The steps of forming the completed sealby this die are clearly illustrated in Flg. 7 The strip, as shown in Figure 1, is placed with the lower curved edge 12 within the recess 32 of the lower fixed plate 24, As the head 15 descends, the forming ring 18 in its lower position presses the strip a ainst the lower movable forming ring 28, 1nter-' locking the corrugations 13 where the ends overlap, com ressing them and ironing them out smootl ily (see movement compresses the, springs 21, allowing the holding ring 19 to come into contact with the lower movable ring 28 forming a continuous curl 39 from the upper edge 11 of the strip within the re 'sterin curling recesses 37 and 38 (see B Fig-.7

urther downward movement'forces the strip edgewise through the recess formed between the ridge 33 and the recessv32 and bends it upward to form a U gsee C Fig. 7). Still further downwar movement brings the curling groove 34 in the ring 18 into registration with the contact surface 36 of the ring 24, forminga second bead or curl 41 from the edge 12'of the strip '(see D Fig. 7). This completes the formin process and the head 15 is moved out of engagem'ent with the head plate 16, the forming ring 18 returning to. its normal position under the action of the springs 21. w

As shown more clearly in Figs. 4 and 5, it is necessary to provide a spam g from Fig. 4, in

g strip 10 an amount between the die members equal substantially to twice the thickness of the strip itself throughout the entire circumference of the die members, in order to insure that the finished sealing ring will have uniform internal and external diameters throughout, even including the overlapping portion designated by the reference numeral 42 in Fig. 2, in which portion the corrugations 13 are out. The reason for this is clearly apparent which there are two thicksmoothed or ironed nesses of material for the entire cross-section,

including both curls 39 and 41, and the U- shaped section 40. This necessitates that the I corrugations 13 be ofiset from the face of the substantially equal to the thickness of the strip, so that when the overlapped portions of the strip are compressed, ironing out the corrugations, the overlapped portion will be the same outside diameter as that defined by the outer engaging portions of the corrugations 13. This exterior and interior diameters of the formed ring will be uniform, presenting no uneven portions, even where the ends of the strip are overlapped for the proper engagement and application of the sealing ring.

insures that the It is thought that this invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the

form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A sealing ring comprising a strip of sheet metal, said strip having a corrugatedportion and having overlapping ends, the

corrugations on the overlapped end portion being flattened out.

'2. A circular sealing strip with overlappedends having corrugations of substantially the thickness of the material of the str1p,.the

corrugations being ironed out in the overlapv ping portions to maintain the mner'and outer of the ring un form efi'ectlve dimensions throughout.

3. A circular sealing strip with overlapped ends, a portion of the strip having corrugations of a depth substantially equal to the gauge of the metal, the corrugations of the overlapped portions being interlocked and smoothed out to maintain a uniform thickness of metal.

4. A- circular sealin stri of U-shaped g cross-section with over appe ends, one leg of the U having corrugations of a depth substantially the gauge of the metal, the corrugations in the overlappingends bemg mterlocked and ironed out to uniform interior and exterior diameters.

5. A circular sealing strip of U shaped provide a ring of.

cross-section with uniform interior and exterior diameters, said strip having a smooth portion where the ends are'overlapped and joined, the remainder being corrugated, said corrugations having a depth substantially the gauge of the metal.

6. The method of forming sealing rings, which comprises overlapping the ends of 'a partially corrugated 'strip of sheet metal, and

' edge, an upright U-shape in its intermediate part, and a curl at the other edge and compressing the corrugations in the overlapped portion.

9. The method of forming sealing rings from a partially corrugated strip of sheetmetal, which consists in overlapping the ends of the strip in circular form, in interlocking.

I and ironing out the corrugations in the overlapping portion, in forcing the strip edgewise and forming the strip with curls at its edges and U-shaped under its. intermediate part, thereby producing a circular U-sha'ped ring, curled at both edges and of uniform inner and outer dimensions. i

10. The method of forming sealing rings from corrugated sheet metal strips, which consists in bending the strips to annulate form with the ends overlapping and the corrugations interengaging, in compressing the overlapped end portions to iron out the corrugations in the overlapping portions in forming the upper edge into a cylindrical curl extending around the strip, forcing the strip edgewise to form it into an upright, U-shaped cross-section, forcing the inner edge of the strip into a cylindrical curl, thereby producing a circular U-shaped strip curled at both edges, having overlapped ends, and uniform inside and outside dimensions throughout.

11. A sealing ring blank to secure together container parts, comprising, a strip of sheet metal bent to form an annular body with overlapping ends, said body being corrugated throughout its circumference, the corrugations of one end of said body interlocking with the corrugations of the other end.

12. The method of forming sealing rings to secure together container parts, which consists of bending a substantially fiat strip into an annular blank with overlapped ends,

and forcing said blank through forming dies to form a channeled annular body.

13. The method of forming sealing rings to secure together container parts which consists of bending a substantially flat strip into an annular blank with overlapped ends, forcing said blank'through formin dies to form a channeled annular body, an curling the free edges of said body.

' JOHN M. HOTHERSALL.

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